Forecasting train movement in the future: the moving block

Today, the real-time systems that estimate the running times of a train along the line over the next few minutes are unable to take into account a number of parameters, such as sections with temporary low speed limits because of track work, or the exact possibilities of a given type of locomotive pulling a train of a particular weight.

A more precise calculation of train times will be needed in the future, when lineside signals will give way to cab signals based on moving blocks. In such a system, a fail-safe train tracking system watches each train moving along a section of track, and slows it down as required to keep it a safe distance behind the train in front of it.

Such a system promises higher track capacity than today's fixed blocks, which enforce a distance between trains that is often much longer than that required for a following train to stop safety if the train in front suddenly slows or stops.

A prerequisite for moving blocks the replacement of lineside signals with in-cab signaling. As of 2000, this was being tested on SBB's Olten-Luzern line between Zofingen und Sempach-Neuenkirch (see this May 16, 2000, SBB news item in German.)

A related long-term goal is automatic driving. The main role of the person in the cab would then be to stop the train if a person or object is on the tracks, especially when entering or traversing stations.